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Kernel Space: On-Demand readahead

Jun 01, 2007, 06:45 (0 Talkback[s])
(Other stories by Jonathan Corbet)

"'Readahead' is the act of speculatively reading a portion of a file's contents into memory in the expectation that a process working with that file will soon want that data. When readahead works well, a data-consuming process will find that the information it needs is available to it when it asks, and that waiting for disk I/O is not necessary. The Linux kernel has done readahead for a long time, but that does not mean that it cannot be done better. To that end, Fengguang Wu has been working on a set of 'adaptive readahead' patches for a couple of years..."

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